Leo Mazzone was fired as pitching coach of the Orioles on Friday, less than two weeks after completing his second season with a struggling staff. Mazzone worked wonders with the Braves from June 1990 through the end of the 2005 season but could not duplicate that success with the Orioles. Baltimore ranked 29th among 30 teams with a 5.17 ERA and yielded more walks (696) than any major league club.